# Large Documents

> Handle long documents in Windows Forms: 64-bit builds, Selection objects and Selection.Load in one undo step, text replacement in large DOCX files, PDF size.

- **Product:** TX Text Control .NET for Windows Forms
- **Section:** Documentation
- **Kind:** Topic
- **Path:** TX Text Control .NET for Windows Forms > Performance > Large Documents
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/llms-full.txt

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## On This Page

- [Run the Application as 64-Bit](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#run-the-application-as-64-bit)
- [Build Large Content in One Step](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#build-large-content-in-one-step)
- [Replace Text in Many Large Files](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#replace-text-in-many-large-files)
- [Preview Large PDF Files](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#preview-large-pdf-files)
- [Keep PDF Output Small](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#keep-pdf-output-small)
- [Next Steps](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/large-documents/#next-steps)

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## Nearby

- **Previous:** [UI Threading and Background Operations](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/threading/llms.txt)
- **Next:** [Memory Usage and Resource Disposal](https://docs.textcontrol.com/tx-text-control-dotnet-winforms/performance/memory-usage/llms.txt)